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strcase.c

/* Strcase.c - Case-independent string comparisons.
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

/****************************************************************************/
/* RCS info. */

#ifndef lint
static char *RcsId = "$Id: strcase.c,v 2.0 1997/09/06 11:56:40 malc Rel $";
#endif /* ! lint */

/****************************************************************************/
/*LINTLIBRARY*/
/****************************************************************************/
/*
 * This array is designed for mapping upper and lower case letter
 * together for a case independent comparison.  The mappings are
 * based upon ascii character sequences.
 */
static unsigned char charmap[] = {
      '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
      '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
      '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
      '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
      '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
      '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
      '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
      '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
      '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
      '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
      '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
      '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
      '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
      '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
      '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
      '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
      '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
      '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
      '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
      '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
      '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
      '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
      '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
      '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
      '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
      '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
      '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
      '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
      '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
      '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
      '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
      '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
};

/****************************************************************************/
int strcasecmp(s1, s2)
char *s1, *s2;
{
      unsigned char *cm = charmap;
      unsigned char *us1 = (unsigned char *) s1;
      unsigned char *us2 = (unsigned char *) s2;

      while (cm[*us1] == cm[*us2++])
            if (*us1++ == '\0')
                  return(0);
      return(cm[*us1] - cm[*--us2]);
}
/****************************************************************************/
int strncasecmp(s1, s2, n)
char *s1, *s2;
int n;
{
      unsigned char *cm = charmap;
      unsigned char *us1 = (unsigned char *)s1;
      unsigned char *us2 = (unsigned char *)s2;

      while (--n >= 0 && cm[*us1] == cm[*us2++])
            if (*us1++ == '\0')
                  return(0);
      return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
}
/****************************************************************************/

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